Screening device



H. H. CHILDERS.

SCREENING DEVICE. APPLICATION FILED MAR. 55. 1920.

1,380,289. Patented May 31, 1921.

IN V EN TOR.

ChUders I ATTORNEYS.

UNITED STATES PATENT OFFICE.

HENRY H. CHLLDERS, or LOUISVILLE, KENTUCKY.

. SCREENING DEVICE.

Specification of Letters Patent.

' Patented May 31, 1921.

Application filed March 5,1920. Serial No. 363,381.

' new and useful Improvements in Screening Devices, of which thefollowing is a specification.

' My invention relates to screening devices. An important object oftheinvention is to provide simple and reliable means for striking orvibrating the screening element in the device, at proper intervals, formaintaining the same open or clean during operation.

. A further object of the invention is to provide hammering orvibrating' means, of the above mentioned character, the driving elementsof whichmay be arranged wholly upon one side of the screening box, andhence out of the path oftravel of the material discharging through thescreen.

A further object of'the invention is to provide means whereby the speedof operation of the hammers may be varied, and means for,instantaneously retracting the hammers from the hammer platea'after theblows havegbeenstruck. M v I Other objects and advantages of theinvention willbe apparent during the course of the followingdescription.

In the accompanying drawings forming a part of this specification and inwhich like 'jnumeralsareemployed to designate like parts throughoutthesame,

' Figure 1 is a side elevation of a screening device embodying myinvention, parts beingin section, on line I AA of Fig. '2,

AFig; 2 isa planview of the device, parts being omitted.

In the drawings, wherein for the purpose of illustration is shown apreferred embodiment of my invention, the numeral 1 designates a screen,which may be of wire fabric of any suitable gage, as may be re quired?for the particular work to be done. This screen is arranged within andsecured to a horizontally. or longitudinally vibrating fscreenwbox 2,having its forward end closed and its rearend open. The screen 1.is'inclined toward the open rear end of thescreen, box, to dischargethrough this end the material which-is too large to pass through thescreen 1. The screen box 2 is pivotally supported by hangers 3, havlngpivotal connection with eye-bolts 4, which are in turn secured to beams14:.

The screen box 2 is longitudinally reciprocated or vibrated by meansincluding a drive shaft 5, having an eccentric 6, engaging an eccentricstrap 6. This eccentric strap is connected with a rod 7, pivotallyconnected with a bracket ,8, secured to the forward end of the box 2. 1

The drive shaft5. has a pulley 1O rigidly secured thereto, to engagewith a belt 11 engaging a pulley -11, rigidly secured to a horizontalcam shaft 12, extending transversely above and .spaced'from the box 2.The cam shaft is supported in suitable bearings. g

vThe cam shaft 12 has cams 13, rigidly secured thereto, the ends ofwhich are preferably curved, as shown. These cames are arranged indifferent longitudinal vertical planes, and are disposed to cngagewithcam rockers 15, normally assuming an upstanding position. These camrockers preferably have their upper or free ends bent laterally towardthe cams, forming. trip extensions 15, for effecting a quickdisengagement between the hammers and hammer plates, after the blows arestruck.

The numeral 16 designates hammers or striking elements, the free ends ofwhich. 7

are preferably slightly bent upwardly. These hammers are arranged toimpinge against hammer plates 17, These hammer plates are disposedbeneath the screen 1 and are secured thereto and extend longitudinallythereof. In the drawings I have shown four hammers 16 and hammer plates,but the invention is inno sense restricted to this number, as the samemay be varied, as maybe found advantageous. The hammers 16 are rigidlysecured to horizontal transverse hammer-rock shafts 18, arranged beneaththe screen 1, andjournaledin bearings 19, secured to beams 9. Springs20, preferably of the leaf type, are secured to the floor, and serve tomove arms or cranks 21 downwardly, being connected therewith by rods 22,having pivotal connection with eye-bolts 23, as shown. The arms 21 arerigidly secured to the hammer rock shafts 18.

Particular attention is called to the fact that the cams 13 and camrockers15 are arranged wholly upon one side of the box 2, while the arms21, and associated elements are arranged wholly upon the opposite sideof the box, with the cam shaft 12 above the box. The hammer rock shafts18 and ham' mers 16 are therefore the only elements disposed beneath thescreen, in thepath of travel of the descending material.

The operation of the device is as follows:

The material to be treated, such as lime, plaster, or the like, isintroduced into the box 2, at the upper closed end thereof. The shaft 5is rotated in the direction of the arrow, in Fig. 1, and the screen islongitudinally vibrated or reciprocated. The shaft 12 is also rotated inthe direction of the arrow, Fig. 1, and the earns 13 are successivelybrought into engagement with the trip sections 15 of the cam rockers,whereby the hammer rock shafts 18 are turned. The hammers 16 are"thereby moved upwardly quickly, and impinge against the hammer plates17, thus vertically vibrating the screen 1. As soon as the cams 13 turnoff of the trip sections 15', the springs 20 and associated elementsmove the hammers 16 downwardly, substantially instantaneously, asufficient distance so that these hammers disengage the hammer plates17,

' the hammers moving downwardly a farther distance, when the cams moveaway from the cam rockers.

It is to be understood that the form of my invention herewith shown anddescribed is to be taken as a preferred example of the same, and thatvarious changes in the shape, size, and arrangement of parts may beresorted to without departing from the spirit of my invention, orthe'scope of the subjoined claims.

Having thus described my invention, I claim:

L'In a device of the character described, a longitudinally vibratingmemb'erembody ing a screen, means to vibrate the member longitudinally,hammer rock shafts arranged beneath and extending transversely of thelongitudinally vibrating member and projecting outwardly beyond thesides of the same, a transversecam shaft arranged above thelongitudinally vibrating member and extending outwardly beyond one sidethereof, cams disposed upon one side of the vibrating member and carriedby the cam shaft, cam rockers disposedupon the same side of thevibrating member and secured to the hammer rock shafts and arranged tobe engaged by said cams, yielding means arof the vibrating member andcarried by the cam shaft, cam rockers disposed upon the same side of thevibrating member and secured to the hammer rock shafts and arranged tobe engaged by said cams, arms arranged wholly upon the opposite side ofthe vibrating member and connected with the hammer rock shafts, springsarranged beneath the arms, means connecting the springs and arms,hammers arranged beneath the screen of the vibrating member and securedto the rock shafts, and hammer plates secured to the lower side of thescreen to be engaged by the hammers.

8. In a device of the character described, a box, a screen held withinthe box, pivot means supporting the box, means to' move the box upon itspivot means, a hammer rock shaft arranged beneath the box and projectingoutwardly beyond the same, a cam shaft extending above the box andprojecting outwardly beyond the same, a cam secured to the outer portionof the cam shaft, a cam rocker carried by the outer portion of thehammer rock shaft to engage with the cam, a hammer arranged beneath thescreen and secured to the hammer rock shaft, a ham- 'mer plate carriedby the screen and arranged to be struck by the hammer, yielding. meansto turn the rock shaft in one direction, and means to drive thefcamshaft. 4.- In a device of the character described, a box, a screen heldwithin the box, pivot means supporting the box, means to move the boxupon itspivot means, hammer rock shafts arranged beneath the box andextending transversely of the box, cam rockers carried by the hammerrock shafts, a cam shaft arranged above the box and extendingtransversely thereof, cams secured to the cam shaft and arranged toengage the cam rockers, leaf springs arranged beneath the hammer rockshafts, arms secured to the rock shafts, means connecting the leafsprings and arms, hammers carried, by the rock shafts, hammer platessecured to the screen and adapted to be struclc by the hammers, andmeans to'drive the cam shaft. 5. In a device of the character described,a movable member embodying a screen, hammer plates secured to thescreen,a hammer rock shaft arranged near the screen, hammers carried bythe rock shaft and arranged beneath the hammer plates to strike thesame, a cam rocker secured'to the hammer rock shaft and provided with alaterally extending trip element, a rotable cam shaft, and a cam securedto the cam shaft and adapted to engage the trip element, and means toturn the rock shaft in one direction to quickly move the hammers awayfrom the hammer plates when the cam disengages the trip element.

6. In a device of the character described, a movable member embodying ascreen, means to move the member, a hammer plate secured to the screen,a rock shaft arranged near the screen, a hammer carried by the rockshaft to strike the hammer plate when the rock shaft is positivelyturned in one direction, a cam rocker secured to the rock shaft topositively turn it in the said one direction and having a laterallyextending trip element, yielding means connected with the rock shaft toturn it in an opposite direction to quickly move the hammer from contactWith the hammer plate, a cam arranged to engage With the trip element,and means to rotate the cam.

In testimony whereof I affix my si nature.

HENRY H. CHILD RS.

